HARVARD OBSERVATORY AND THE HENRY DRAPER MEMORIAL. This falls upon the photographic objective and is ENLARGING APPARATUS. SECTION OF ENLARGING APPARATUS WITH CYLINDRICAL LENS., scientific american, 1887-10-15
HARVARD OBSERVATORY AND THE HENRY DRAPER MEMORIAL. This falls upon the photographic objective and is ENLARGING APPARATUS. SECTION OF ENLARGING APPARATUS WITH CYLINDRICAL LENS., scientific american, 1887-10-15
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